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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dbb123ec737e39282430989ca4b6d8e65b3ca478df250ec0cbd5ff98e10fe4' 
  AND token = 'Y+q8OSWZy895IvYPJdEYarEM09K514QIhXQT1ifr/tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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