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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4c07b5b5bdd8351d9eefe6660abc2aef8fde9008d2f4cf8a5f942b03f7aa2d' 
  AND token = 'N+8TwgODxFUIihZMCPyZSMYpNMFIgLFTg1LVHlWJOLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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