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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0415d10bb9a2b2e0e91e17f8bc340089b71bd5630f9fd06cf7a5f4c84cb402c8' 
  AND token = '4pHYCdIoyPZcvTxHVZXnUAPThc7Kbn6csQT9ncq1DKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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