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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c16c6308233165d56e6e74db072c2ffca82f6005b773a66608efb7954070bb' 
  AND token = 'j3NOYGIMd6ssxHYvZiqHlYkiB8+Kg0LIMX8ELN5P7Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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