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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026de139af1ef972d9d79152aa53cb8a9b93fe825b53f0a3290ad97c436a3912' 
  AND token = '8bcd+KifS3/m6G2aUSJz1w0xgm37FcoIhZb3Piqg22M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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