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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb494b0d17eb1d5b2ab9d2c3047506dd11a2e5a710c6102def1b27b4aa98904' 
  AND token = 'T2qsUl9rfWlKhP5GdI9NVdk9c1R0AeDfGsYHez2l+0w=' 
  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"
    }
  }
}