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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020f4dcbff7232daa441681b9749e5d427268c3205185ead653386749251709a' 
  AND token = 'SIS76saZ5gphW27SwE+M3Zfw3cRN17Cv50N1XQYMyAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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