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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd640766556b01afa7bf2bb70b43d16f17984978929dcf97d34d14d4ad414013b' 
  AND token = 'F2j7Ms4Y0cAOEjsranvpEiIXu8rPRGP9Eq7gJfBuHVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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