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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0be6d91b946fc5ad7b4304f4b1d76a067bc058fbf44a6f749b7579856d5e48' 
  AND token = 'rEf2WvpLNIWO396XQizgUD1iaG8nCEognd8NIk0fE+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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