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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3007be347f9325af14a96418b0f95e01fa9659462add57a8ea77667718f5491' 
  AND token = '/WWSnrWN11adu3g3cR6MfcSoF0W9coJUeZjvUVO4C2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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