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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4360e7f35f74cf36725081898555575eba3be3db4ebee5304f3b4fbcd5aa9e87' 
  AND token = 'R0u6G7a4Y6a8+osJzndbXdlBrZCyUBaLpUJl1Amw8os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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