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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccaa74ea3512feb7d60a56d976c96e026b8b3a3a374e02f2554fe76100ae076' 
  AND token = 'miPKq+6Eii8jDFLwWAAw1eDN0CpNEX2faIGsJXexvVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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