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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2220651c0fcd74d08f2b74804b1ec7021ceba4b4aa11747fd3d52af626ea6a78' 
  AND token = 'Yd9u1jTEegWcSZg8X40y6UmhWlnhy1LHkbU7up/PGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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