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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8ce3f929d460561c09b6ab06da4abd05839647275f7eabe9ae5436033a30c' 
  AND token = '68KordAKrXHvKVJ40ndpYL7YI2wLsMeFyy9t53sa+7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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