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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c742abe990d7fa4b5953d49401e6409ee1f7f5e0b98e5652beb69ec9ae5f4e' 
  AND token = 'MA+08Iylry+sr5eFnSJOqHyc9gKragQIYBtyQg08mV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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