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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a1f44dd7606ae01c0a9c4c4249270e82beca48fc12b2414360bdb1f5209488' 
  AND token = '9Ct9rDw4VqJ9So0g8jcvHN0dIJXnRMYxZmDmjO2zPXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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