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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243568c2f166c0ebf7c973a70a72f2d7a896d4e9e1917e86cf980f4a09ea3036' 
  AND token = 'OKZxOSt2tQeMsD1BPeldeZgasgEEtJSYA/gJL51e9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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