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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfa209fab2f5760117684af1c060b3c8804303e40dfc411b0c4930d7eb3c8ed' 
  AND token = 'gwZvw3EW4gZj89P7MTbB51OAlxkE5WPRSN/gHQZsIvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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