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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d5f0ac1d13bd762737e05a0e11a35c59ce7395ec1ceaea8baf198fd0f55902' 
  AND token = 's8x6pUhRJ0DRqhon6M/ablNuuhIOCf/7cnvlsaOYQEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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