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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46763b82185e006a845ba22ffffd3a51ad7fe89c44de71e1c61996b600f6573' 
  AND token = 'EOwgY2wHl7gWZvcaKA10pDtecKx9PYWx6j7eKj5aMss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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