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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e102a0e9c59a3e52854f54427d1a7c2e701a3f3b284a49722cf3e0e66d65853c' 
  AND token = '9wb1RqosxjDAgP6wuXASXzPNGRDOIzGzVQt3487Gwn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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