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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f922ba731d8c85bee292a9627d1ef6c3191158b659e3c8f360ed02d34c1ee7' 
  AND token = 'XMnH+wSGjYIdTFsI9A/dnjfBqVS8sVEved07OS3fs4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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