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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a483667f73637d6d3da4f014ab79b6c29ca596c2a9cf35213627bc81dce9deb' 
  AND token = '7R4XHCHNYjUDi9xXLchMwZT2LDvQY0zkSzWEyBvq4fk=' 
  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"
    }
  }
}