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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c69468c83c9948e1ad09ccfa3f65f23132f7d0790afc38b4a801e1c787f9507' 
  AND token = 'CflxhMEJ9K1sbwUEbMqIo7i6SXbG6p1TTX/oqx3NyEc=' 
  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"
    }
  }
}