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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812d14a1cc28190a310037939bf0ec4cd92c5e901d4c9ab35fd125c330b92227' 
  AND token = 'cPDxTQ1kVLQ8bm4eTxJl/jFQDe7ilvkjyKmAKtf8NjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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