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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13be322d27fb6364e8a157d838010f8f012fbeaf69060b5ef3721001b74c2d5d' 
  AND token = 'Qyfa63Gsw9M1qPKCPjQoCUtqhHaT2U+4ZIOBqf4NeqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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