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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfb0bc6188ea822e0c65c62438ce7c78ebf2bf75d81b7a8b64ba104f2ccdb9a' 
  AND token = '6ikQPSnuqv+q4DTwHQCdXx1yt16c4B9P206vN/dtqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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