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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe63cbeabbd925d4e9358a68ebdc0f9108a9f82ae0bb46f3a72db5835210307' 
  AND token = 'BU4SjBkvn5z94UamoofCT7d71jOmlEVAg61Vq9LbcXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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