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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c3a6c4a28e115053b080f9a87f62159a72d7b4ddb18782a20c7ccb6d62c65c' 
  AND token = 'JigRZ4D0AU4drFen3hS+Dt+A0UNyLqMFpDoqMISk5+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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