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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a9bcc91f7edecb784f6e7923d5a44f8fd48698a558b7179077733ae34c8333' 
  AND token = 'wP4dxNmCQALdT5fHJ6QLewtr/OH0bVD1xGD6ETaRjwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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