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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc23c14e0a48639b765bf20c0944e622bfc84c833ca85249954788d045e94c1' 
  AND token = '43I5P91p1yYVFlsT0ME/VfRiX6nPo26rl+faYe7mC9c=' 
  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"
    }
  }
}