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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c9fedffaf1040ec9d29c49f48bd8adbf25abeb8707e8e624f967e19c02b10b' 
  AND token = 'xDj9MDuUfByau74sm2Fbt8N06RwKqqeXkw3GrvvZfvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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