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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b00c824d891bcc131c1ae7db1e2a9b8c82209fe4dd4c46b0656e839c1ec40b' 
  AND token = 'wsZfqWF7zZipjECumw37uc+bLe7io5f6aSdw6x5aEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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