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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fec6e2b546dbdf219ba2ab94bb29a2c5bbf3293430c1e6c725ade58c369eed7' 
  AND token = 'QfD1BcNGBqsvX7mnS936tmWZVjyPs2pVKdJkuRQE3gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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