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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a88e23d6d80819a09670e9add03ce624f9d93e063055a2df43e3f14876451a0' 
  AND token = '6sVTcro4hH1dsZUqh0tk0CgPOIciR7o6pX8+VI+eKNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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