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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456258467a04ddf4d9ab36d6ad0a4c802d6d81385436224734db0445b0df4d6f' 
  AND token = 'c4lIAI9m1nlSy4q11nQlYex8Z6DlcNUowHSlbP0EL2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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