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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708ccb8197d159373fdbf1a645e032b48f1fd8b68f82b4ccdd4629b590506c15' 
  AND token = '2L+93OrJsBGwIAikIzxMWop8C9dJmrsxKAFNByiB1/c=' 
  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"
    }
  }
}