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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64668b3d6cfa5b54982c46c384ed1b81bd9824ae9b8dda2ca1daf9ff7edefdc9' 
  AND token = '2OLSqIilVALLZZ0mCdKYygOhTkSd2aPDKOh9H8PBaic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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