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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7883843614ae2be690070dd28238abc935f3830c8f4a6489e0e09f5fa2609b85' 
  AND token = 'WG0xzEgcD33F5FklbC/cuOBmR+8A0NY/UTqZKk/OuIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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