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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fc3f97fadb8211cafb1a5552f405812e43018ba001bbd8855f0e3042d3d95e' 
  AND token = 'kAw3jnU0HBsvG/93rvtnT2LD9Km73lLehwsSk2pXwos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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