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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264a645b7601649aeca5675f28fc8996627aa5850c155c1ae04d275a4888b3f2' 
  AND token = '8ccfSaNsjnmM4pX5teM2oAg1BRFk1ZXkx23g52XVkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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