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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e970e627d8c106c49d12d29bab2a7a60a6225f29c038fe0a7d00dd6846bdc08' 
  AND token = 'DNRD94dmmuRASqtVYlVtH4fAPL3gsiUIE+PO2XembLE=' 
  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"
    }
  }
}