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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f8430f4ff486523c2497bdf657c07a91b70bf5071769dfc0fe94af178ccd70' 
  AND token = 'NavMYtKz31oAQTiDMCc2PaJoY8p90fn7KVY33PUOZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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