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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bf1ab4783db5c85b463e65ea1a9ee7a5805ddf2d6b2b14c10a3e817cf9c047' 
  AND token = 'FCaxEnrTyhOw/nn58EM/Wq4BeRMGQJrWlkzOY+FvCYY=' 
  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"
    }
  }
}