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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942f583c3428dea1f1566daa7ab464f10db03653d0029c5b8e9363e994c5b55b' 
  AND token = 'vYpw4UF/oK50+H62cbtF8xfk1cb/Iqn2S/7Q1NNcq2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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