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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7659269ea61cd9f7cd78fa166834afab890e19e36338585ffa3e4ae42ad1e1' 
  AND token = 'pjg7ttyVaF+NvR/hNeS3W9tCXTgwxebf2dvlXaMkjWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}