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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac51066681522336c8b9f91f057d8d8d395a67c0b66e9eb81dc3782268c6f6de' 
  AND token = 'e7mMyDppTol7yG8ccZ4jS+ZkcTW+Jclc3Gcv7fWQN7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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